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Altera_Forum's avatar
Altera_Forum
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16 years ago

Clock for IMB SRAM IN NEEK

Hi all,

I have a very small issue in using the 50 Mhz external clock for accessing the SSRAM. When i use a PLL to generate a 50 MHZ clock i was able to run a hello world program out of SSRAM but if i try to access the SSRAM via the 50MHZ external clock i get the error

LEAVING TARGET PROCESSOR PAUSED.

What does this error mean? Is it not possible to access the SSRAM using the 50 MHZ external clock or should there be anything that should be looked upon before using it.

Many Thanks,

Shyam JUde J

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    If I rembember well, the SSRAM clock must be -3ns displaced with respect to CLOCK_50 (system clock). So, a PLL is needed.

  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    So u mean to say that a PLL Clock is always necessary when you use a SSRAM. Are you sure about it?

  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    Sorry, my last answer was imprecisse. I meant SDRAM instead of SSRAM. Also, my experience was with DE2.

    I've used SSRAM with the original CLOCK_50, without PLL, on DE2.